DIAGNOSTIC STARTING POINT
Begin the system diagnosis by reviewing DESCRIPTION & OPERATION . Reviewing the description and operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation. See SYMPTOM DIAGNOSIS in order to identify the correct procedure for diagnosing the system and where the procedure is located.
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control system. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom
- Shift Lever Does Not Move With Brake Pedal Depressed.
- Shift Lever Can Be Moved Without Brake Pedal Depressed.
See appropriate test under SYMPTOM TESTS .
SYMPTOM TESTS
| CAUTION | Use caution when probing fuses or junction blocks, or any connectors. Damage may result to connector receptacle if probe or terminal being used is too large. Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result. |
| Symptom | Test |
|---|---|
| Shift Lever Does Not Move With Brake Pedal Depressed | A |
| Shift Lever Can Be Moved Without Brake Pedal Depressed | B |
SYMPTOM TEST INDEX
TEST A: SHIFT LEVER DOES NOT MOVE WITH BRAKE PEDAL DEPRESSED
Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .
- Did you review SYMPTOM DIAGNOSIS and all the necessary inspections? If so, go to next step. If not, see «SYMPTOM DIAGNOSIS»(ref-134984-S16638511602002022100000) under TROUBLE SHOOTING.
- Turn ignition switch to the ON position. Depress the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-134984-S16638511602002022100000) under TROUBLE SHOOTING. If not, go to next step.
- Turn ignition switch to the OFF position. Disconnect the stoplamp switch. Turn the ignition switch to the ON position. Press and hold the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to step 6 . If not go to next step.
- Turn ignition switch to the OFF position. Disconnect the shift lock solenoid. Turn the ignition switch to the ON position. Press and hold the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to step 7 . If not, go to next step.
- Inspect shift lock solenoid for poor connections. Did you find and correct the condition? If so, go to step 10 . If not, go to step 9 .
- Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step 10 . If not, go to step 8 .
- Repair the short to battery voltage in the shift lock solenoid voltage supply circuit (Dark Green/White wire). After repairs, go to step 10 .
- Replace the stoplamp switch. See «STOPLAMP SWITCH»(ref-134984-S34174108862002022200000) under REMOVAL & INSTALLATION. After repairs, go to step 10 .
- Replace the shift lock solenoid. See «SHIFT LOCK SOLENOID»(ref-134984-S21736340612002022200000) under REMOVAL & INSTALLATION. After repairs, go to next step.
- Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .
TEST B: SHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED
Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .
- Did you review SYMPTOM DIAGNOSIS and all the necessary inspections? If so, go to next step. If not, see «SYMPTOM DIAGNOSIS»(ref-134984-S16638511602002022100000) under TROUBLE SHOOTING.
- Turn ignition switch to the ON position. Apply the parking brake and block the wheels. Attempt to move the shift lever out of the Park position without pressing the brake pedal. Does the shift lever move out of the Park position? If so, go to next step. If not, see «SYMPTOM DIAGNOSIS»(ref-134984-S16638511602002022100000) under TROUBLE SHOOTING.
- Turn ignition switch to the OFF position. Ensure gearshift lever is in the Park position. Connect a test light between ground and the voltage supply circuit at the BTSI fuse (10-amp). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step 8 .
- Connect a test light between ground and the stoplamp switch voltage supply circuit (Light Green/Black wire) at stoplamp switch. Does the test light illuminate? If so, go to next step. If not, go to step 14 .
- Connect a test light between ground and the stoplamp switch control circuit (Dark Green/White wire) at stoplamp switch. Press and release the brake pedal several times. Does the test light turn ON and OFF with the brake pedal? If so, go to next step. If not, go to step 11 .
- Connect a test light between ground and the shift lock solenoid voltage supply circuit (Dark Green/White wire) at the shift lock solenoid. Does the test light illuminate? If so, go to next step. If not, go to step 15 .
- Test the shift lock solenoid ground circuit (Black wire) for an open or high resistance. Did you find and correct the condition? If so, go to step 20 . If not go to step 12 .
- Turn ignition switch to the OFF position. Disconnect the PNP switch connector. Connect a test light between ground and the PNP switch ignition feed circuit (Pink wire) at the PNP switch. Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step 13 .
- Turn ignition switch to the OFF position. Connect a 10-amp fused jumper between the ignition feed circuit (Pink wire) and the park signal circuit (Light Green wire) at the PNP switch. Connect a test light between ground and the stoplamp switch voltage supply circuit at the BTSI fuse (10-amp). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step 16 .
- Inspect for proper PNP switch adjustment. See appropriate AUTOMATIC article in AUTOMATIC TRANSMISSIONS. Inspect the PNP switch for poor connections. Did you find and correct the condition? If so, go to step 20 . If not, go to step 17 .
- Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step 20 . If not, go to step 18 .
- Inspect the shift lock solenoid for poor connections. Did you find and correct the condition? If so, go to step 20 . If not, go to step 19 .
- Repair the open or short in the PNP switch ignition feed circuit (Pink wire). After repairs, go to step 20 .
- Repair the stoplamp switch voltage supply circuit (Light Green/Black wire) for an open or short. After repairs, go to step 20 .
- Repair the open in the shift lock solenoid voltage supply circuit (Dark Green/White wire). After repairs, go to step 20 .
- Repair the open or short in the PNP switch park signal circuit (Light Green wire). After repairs, go to step 20 .
- Replace the PNP switch. See appropriate AUTOMATIC article in AUTOMATIC TRANSMISSIONS. After repairs, go to step 20 .
- Replace the stoplamp switch. See «STOPLAMP SWITCH»(ref-134984-S34174108862002022200000) under REMOVAL & INSTALLATION. After repairs, go to step 20 .
- Replace the shift lock solenoid. See «SHIFT LOCK SOLENOID»(ref-134984-S21736340612002022200000) under REMOVAL & INSTALLATION. After repairs, go to next step.
- Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .